How Expensify Uses Agent-Device for Mobile Bug Evidence and Profiling

TLDR Dev · 2 weeks ago

Expensify built agent-device, a tool that gives AI coding agents the ability to see and interact with mobile apps through structured accessibility trees and platform-agnostic commands, rather than just screenshots and coordinates. The company created agent-device-evidence to automatically reproduce bugs and collect before/after video evidence across platforms by parsing issue descriptions and replaying saved scripts, reducing what took five minutes per platform to automation. This frees developers from manual testing loops, allowing agents to handle mobile workflows like bug reproduction, performance measurement, and React profiling while engineers focus on building product features.